161 lines
6.0 KiB
Makefile
161 lines
6.0 KiB
Makefile
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# This is an OpenWatcom make file which builds pnglibconf.h - the libpng
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# configuration header. You can ignore this file if you don't need to
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# configure libpng; a default configuration will be built.
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#
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# For more information build libpng.wpj under the IDE and then read the
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# generated files:
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#
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# config.inf: Basic configuration information for a standard build.
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# pngconfig.dfa: Advanced configuration for non-standard libpng builds.
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#
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DELETE=rm -f
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ECHO=echo
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COPY=copy
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#
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# If your configuration needs to test compiler flags when building
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# pnglibconf.h you may need to override the following on the wmake command
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# line:
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CFLAGS=
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CC=wcl386
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CPP=$(CC) -pw0
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#
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# Read awk from the environment if set, else it can be set on the command
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# line (the default approach is to set the %awk% environment variable in the
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# IDE libpng.wpj 'before' rule - this setting is local.)
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!ifdef %awk
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AWK=$(%awk)
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!endif
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#
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# pnglibconf.h must exist in the source directory, this is the final rule
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# which copies the local built version (and this is the default target for
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# this makefile.)
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..\..\pnglibconf.h: pnglibconf.h
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$(COPY) pnglibconf.h $@
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!ifdef AWK
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# CPPFLAGS should contain the options to control the result,
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# but DEFS and CFLAGS are also supported here, override
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# as appropriate
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DFNFLAGS = $(DEFS) $(CPPFLAGS) $(CFLAGS)
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pnglibconf.h: pnglibconf.dfn
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$(DELETE) $@ dfn.c dfn1.out dfn2.out
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$(ECHO) $#include "pnglibconf.dfn" >dfn.c
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$(CPP) $(DFNFLAGS) dfn.c >dfn1.out
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$(AWK) -f << dfn1.out >dfn2.out
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/^.*PNG_DEFN_MAGIC-.*-PNG_DEFN_END.*$$/{
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sub(/^.*PNG_DEFN_MAGIC-/, "")
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sub(/ *-PNG_DEFN_END.*$$/, "")
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gsub(/ *@@@ */, "")
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print
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}
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<<
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$(COPY) dfn2.out $@
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@type << >pngconfig.inf
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This is a locally configurable build of libpng.lib; for configuration
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instructions consult and edit projects/openwatcom/pngconfig.dfa
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<<
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$(DELETE) dfn.c dfn1.out dfn2.out
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pnglibconf.dfn: ..\..\scripts\pnglibconf.dfa ..\..\scripts\options.awk pngconfig.dfa
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$(DELETE) $@ dfn1.out dfn2.out
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$(AWK) -f ..\..\scripts\options.awk out=dfn1.out ..\..\scripts\pnglibconf.dfa pngconfig.dfa $(DFA_XTRA) 1>&2
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$(AWK) -f ..\..\scripts\options.awk out=dfn2.out dfn1.out 1>&2
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$(COPY) dfn2.out $@
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$(DELETE) dfn1.out dfn2.out
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!else
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# The following lines are used to copy scripts\pnglibconf.h.prebuilt and make
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# the required change to the calling convention.
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#
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# By default libpng is built to use the __cdecl calling convention on
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# Windows. This gives compatibility with MSVC and GCC. Unfortunately it
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# does not work with OpenWatcom because OpenWatcom implements longjmp using
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# the __watcall convention (compared with both MSVC and GCC which use __cdecl
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# for library functions.)
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#
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# Thus the default must be changed to build on OpenWatcom and, once changed,
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# the result will not be compatible with applications built using other
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# compilers (in fact attempts to build will fail at compile time.)
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#
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pnglibconf.h: ..\..\scripts\pnglibconf.h.prebuilt .existsonly
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@$(ECHO) .
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@$(ECHO) .
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@$(ECHO) $$(AWK) NOT AVAILABLE: COPYING scripts\pnglibconf.h.prebuilt
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@$(ECHO) .
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@$(ECHO) .
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vi -q -k ":1,$$s/PNG_API_RULE 0$$/PNG_API_RULE 2/\n:w! $@\n:q!\n" ..\..\scripts\pnglibconf.h.prebuilt
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@$(ECHO) .
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@$(ECHO) .
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@$(ECHO) YOU HAVE A DEFAULT CONFIGURATION BECAUSE YOU DO NOT HAVE AWK!
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@$(ECHO) .
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@$(ECHO) .
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@type << >pngconfig.inf
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This is the default configuration of libpng.lib, if you wish to
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change the configuration please consult the instructions in
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projects/owatcom/pngconfig.dfa.
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<<
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!endif
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# Make the default files
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defaults: .symbolic
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@$(COPY) << config.inf
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$# The libpng project is incompletely configured. To complete configuration
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$# please complete the following steps:
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$#
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$# 1) Edit the 'before' rule of libpng.wpj (from the IDE) to define the
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$# locations of the zlib include file zlib.h and the built zlib library,
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$# zlib.lib.
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$#
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$# 2) If you want to change libpng to a non-standard configuration also
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$# change the definition of 'awk' in the before rule to the name of your
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$# awk command. For more instructions on configuration read
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$# pngconfig.dfa.
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$#
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$# 3) Delete this file (config.inf).
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<<
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@$(COPY) << pngconfig.dfa
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$# pngconfig.dfa: this file contains configuration options for libpng.
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$# If emtpy the standard configuration will be built. For this file to be
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$# used a working version of the program 'awk' is required and the program
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$# must be identified in the 'before' rule of the project.
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$#
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$# If you don't already have 'awk', or the version of awk you have seems not
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$# to work, download Brian Kernighan's awk (Brian Kernighan is the author of
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$# awk.) You can find source code and a built executable (called awk95.exe)
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$# here:
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$#
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$# http://www.cs.princeton.edu/~bwk/btl.mirror/
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$#
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$# The executable works just fine.
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$#
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$# If build issues errors after a change to pngconfig.dfa you have entered
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$# inconsistent feature requests, or even malformed requests, in
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$# pngconfig.dfa. The error messages from awk should be comprehensible, but
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$# if not simply go back to the start (nothing but comments in this file) and
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$# enter configuration lines one by one until one produces an error. (Or, of
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$# course, do the standard binary chop.)
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$#
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$# You need to rebuild everything after a change to pnglibconf.dfa - i.e. you
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$# must do Actions/Mark All Targets for Remake. This is because the compiler
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$# generated dependency information (as of OpenWatcom 1.9) does not record the
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$# dependency on pnglibconf.h correctly.
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$#
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$# If awk isn't set then this file is bypassed. If you just want the standard
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$# configuration it is automatically produced from the distributed version
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$# (scripts\pnglibconf.h.prebuilt) by editting PNG_API_RULE to 2 (to force use
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$# of the OpenWatcom library calling convention.)
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$#
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<<
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clean:: .symbolic
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$(DELETE) ..\..\pnglibconf.h pnglibconf.* dfn.c *.out pngconfig.inf
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$(DELETE) *.obj *.mbr *.sym *.err *.pch libpng.mk
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$(DELETE) libpng.lib libpng.lbr libpng.lb1 libpng.cbr libpng.mk1
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$(DELETE) pngtest.exe pngtest.map pngtest.lk1 pngtest.mk1
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$(DELETE) pngvalid.exe pngvalid.map pngvalid.lk1 pngvalid.mk1
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distclean:: clean .symbolic
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$(DELETE) zlib.inf awk.inf config.inf pngconfig.dfa
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